At Vitacost, buy one select item and get a second one for free. (Add one to your cart; a second will be added automatically.) Plus, get an extra 10% off when you add an item via Set & Save, dropping pairs to as low as $3.20. That's tied with our mention from last week as best BOGO offer we've seen from Vitacost this year. (For further comparison, we saw buy one item, get 50% off the second last week also.) Shipping starts at $4.99; get free shipping with VitaCost-brand purchases of $25 or more, or all other brand orders of $49 or more. A couple of best bets, with prices after both discounts and $4.99 for shipping: